Sentence examples for has sometimes challenged from inspiring English sources

Clearly Rankin's life has sometimes challenged scholarship — or maybe the relative dearth of biographies has more to do with the general perception that readers of books about the females who have changed the course of American history tend to reside either in women's-history departments or in the classrooms of elementary schools.

Advances in molecular genetics have opened the way for DNA analysis to be incorporated into taxonomy, which has sometimes challenged the historical groupings based on morphology and other traits.

When the subject of Hispanic voting has come up in the past, skeptics have sometimes challenged whether Hispanics really represent a voting bloc.

Proponents of presidential power have sometimes challenged such statutory limitations on a president's discretion to remove an executive branch official, so if a Republican takes over the White House in 2013 and wants to fire Mr. Cordray, it could set up a new round of litigation over the separation of powers.

Whereas this approach has sometimes been challenging [ 36], in large part it has proven successful in bacteria and the yeast Saccharomyces cerevisiae.

The intensity of Fugard's work has sometimes presented challenges for his actors.

Blaug's and Hutchison's criticisms have sometimes been challenged on the grounds that economic theories cannot be tested, because of their ceteris paribus clauses and the many subsidiary assumptions required to derive testable implications (Caldwell 1984).

She says that it has sometimes been a challenge to be married to a man of Ramachandran's mental energy and intellectual curiosity.

Getting the information online has been relatively easy for Windsor and Maidenhead, although pulling together information on disparate contracts has sometimes proved a challenge, given the amount of information that is frequently appended to contracts, sometimes by attaching paper notes, rather than updating computer records.

Nor will it be the athletically challenging experience it has sometimes been in the past.

We had fun practices, sometimes challenged by kids who didn't always listen.